Infectious Bloodlust

Enchanted creature gets +2/+1, has haste, and attacks each turn if able.
When enchanted creature dies, you may search your library for a card named Infectious Bloodlust, reveal it, put it into your hand, then shuffle your library.

If, during its controller's declare attackers step, the enchanted creature is tapped or is affected by a spell or ability that says it can't attack, then that creature doesn't attack. If there's a cost associated with having that creature attack, its controller isn't forced to pay that cost. If he or she doesn't, the creature doesn't have to attack.